I wrote an interpreter that you can use to run Brainf█k programs directly on your calculator. For example, if you wanted to calculate Fibonacci numbers with the +>+[[->+>+<<]<[->>>+<<<]>>>.] program you could enter it like this:

SF 0
3137741313 STO 3
2282741113 STO 4
2228111580 STO 5

...and then run it with "B". (The flag is for "compact mode". Without it it would run in "fast mode" with one instruction per register).